操作 numpy 矩阵..替换一个值

Question

我最近发现了 numpy 及其在矩阵方面的实用性。有一件事仍然困扰着我。如何用所需值替换矩阵中的特定值。我试过了>

matrix1 = np.zeros([10,10])
replacewith = 1
atposition = np.array(5,5)
matrix1[atposition] = replacewith

所以我想做的是用 1 替换中间的 0。谢谢！

Answer 1

import numpy as np
matrix1 = np.zeros([10,10])
replacewith = 1
atposition = (5,5)
matrix1[atposition] = replacewith
print matrix1

输出：

[[ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  1.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]
 [ 0.  0.  0.  0.  0.  0.  0.  0.  0.  0.]]

操作 numpy 矩阵..替换一个值

Manipulating numpy matrices..replacing a value

python

numpy